House of Representatives elections - statewide results

[MT Treasurer]

This map basically shows the margin of victory for each party in each state. I know that the map may seem misleading because there were so many uncontested races, but still, it underscores the huge regional differences and political polarization in the country.
I calculated the difference between the percentage of ballots cast for the Republican party (in ALL districts in a state) and the ballots cast for the Democratic party or vice versa.

2014:

margin of 0-5 pts.: >30% (CO, WA, MN, IL, MI, NJ, NH)
margin of 5-10 pts.: >40% (NM, IA, WI, AK)
margin of 10-15 pts.: >50% (NY, MT, VA, NC, FL, WV, PA, OR, ME)
margin of 15-20 pts.: >60% (AZ, GA, CA, MD, MS, ND, CT)
margin of 20-25 pts.: >70% (MO, IN, OH, DE, RI)
margin of 25-30 pts.: >80% (TX, KS, KY, NE, ID, UT)
margin of more than 30 pts.: >90% (SC, AL, AR, TN, LA, WY, SD, OK, MA, VT, HI, D.C.)

Largest Margins: MA (82.70%-17.30% --> 65.4 pts.) for the Democrats and OK (72.45%-27.55% --> 44.9 pts.) for the Republicans.

Democrats did surprisingly well in CO, NH, NM and WV (they actually did better here than in 2012 in terms of margin of defeat, even though Republicans picked up one seat), Republicans did surprisingly well in OH, MO, NV, MN, NJ, IL, SC and VA (just like in 2012, Republicans won by a bigger margin here than in NC).

Here's 2012:

margin of 0-5 pts.: CO, NV, IA, WI, OH, VA, NC, PA, NH
margin of 5-10 pts.: AZ, FL, IN, MI, WA
margin of 10-15 pts.: MN, SD, ND, MT, NJ, NM, MO
margin of 15-20 pts.: IL, GA, KY, MS, OR, RI, SC, TX, WV
margin of 20-25 pts.: CA, TN
margin of 25-30 pts.: AL, MD, NY
margin of more than 30 pts.: AK, AR, CT, DE, D.C., HI, ID, KS, LA, MA, OK, UT, VT, WY

[Anti Democrat Democrat Club]

Don't know the rest (maybe the carpetbagging issue giving Mooney the short), but NH's margin can be attributed to Kuster running up the score against Garcia (who was probably the most overrated House candidate of 2014).

[Fuzzybigfoot]

Excellent work, thank you!  Btw I had no idea that Democrats won the popular vote in Michigan in 2014.

[Zioneer]

Utah's margin is mostly because of districts UT-01 through UT-03; UT-04 was within 5% if I recall correctly.

[jaichind]

It is so interesting that Dems won the popular House vote NC in 2012 but lost it in VA OH CO NV.  It is also interesting that the 2014 House popular vote map is pretty much the best case scenario for the 2016 GOP map for the presidential race. 

[MT Treasurer]

Swing (2012-2014)

swing of 0-5 pts.: >30% (AR, CA, CO, GA, HI, ID, MI, MT, NE, NH, NM, ND, OR, TN, UT, WY)
swing of 5-10 pts.: >40% (AL, DE, FL, KY, MN, MS, MO, NJ, RI, TX, WA, WV, WI)
swing of 10-15 pts.: >50% (AZ, CT, D.C., IL, IN, IA, LA, MD, ME NY, NC, OK, PA, VA)
swing of 15-20 pts.: >60% (NV, OH, SD, SC, VT)
swing of 20-25 pts.: >70% (AK, KS)
swing of 25-30 pts.: >80% (MA)
swing of more than 30 pts.: >90% (no state)

Trend (2012-2014)

trend of 0-5 pts.: >30% (AL, AZ, CA, DE, D.C., FL, HI, IA, KY, ME, MI, MN, MO, MT, NJ, NM, ND, OK,
                                        TN, TX, WA, WI)
trend of 5-10 pts.: >40% (AR, CO, CT, GA, IL, IN, MD, NE, NH, NY, NC, OH, OR, SC, PA, UT, VT, VA,
                                         WY)
trend of 10-15 pts.: >50% (ID, NV, RI, SD, WV)
trend of 15-20 pts.: >60% (LA, MS)
trend of 20-25 pts.: >70% (no state)
trend of 25-30 pts.: >80% (no state)
trend of more than 30 pts.: >90% (AK, KS, MA)

[ElectionsGuy]

Very cool. Was there a lot of uncontested races in South Carolina? I don't remember.

[MT Treasurer]

Very cool. Was there a lot of uncontested races in South Carolina? I don't remember.

Ugh, just noticed a calculation error there. SC only swung towards the GOP by a margin of 15.23 pts. and trended Republican by a margin 8.33 points. My mistake. Fixed it, sry.
Also, there were two uncontested races in SC in 2012 (1 Democratic and 1 Republican incumbent) and 2014 (2 Republican incumbents).

[MT Treasurer]

2014:

margin of 0-5 pts.: >30% (CO, WA, MN, IL, MI, NJ, NH)
margin of 5-10 pts.: >40% (NM, IA, WI, AK)
margin of 10-15 pts.: >50% (NY, MT, VA, NC, FL, WV, PA, OR, ME)
margin of 15-20 pts.: >60% (AZ, GA, CA, MD, MS, ND, CT)
margin of 20-25 pts.: >70% (MO, IN, OH, DE, RI)
margin of 25-30 pts.: >80% (TX, KS, KY, NE, ID, UT)
margin of more than 30 pts.: >90% (SC, AL, AR, TN, LA, WY, SD, OK, MA, VT, HI, D.C.)

Largest Margins: MA (82.70%-17.30% --> 65.4 pts.) for the Democrats and OK (72.45%-27.55% --> 44.9 pts.) for the Republicans.

Democrats did surprisingly well in CO, NH, NM and WV (they actually did better here than in 2012 in terms of margin of defeat, even though Republicans picked up one seat), Republicans did surprisingly well in OH, MO, NV, MN, NJ, IL, SC and VA (just like in 2012, Republicans won by a bigger margin here than in NC).

Here's 2012:

margin of 0-5 pts.: CO, NV, IA, WI, OH, VA, NC, PA, NH
margin of 5-10 pts.: AZ, FL, IN, MI, WA
margin of 10-15 pts.: MN, SD, ND, MT, NJ, NM, MO
margin of 15-20 pts.: IL, GA, KY, MS, OR, RI, SC, TX, WV
margin of 20-25 pts.: CA, TN
margin of 25-30 pts.: AL, MD, NY
margin of more than 30 pts.: AK, AR, CT, DE, D.C., HI, ID, KS, LA, MA, OK, UT, VT, WY

And here's 2016:

margin of 0-5 pts.: CO, ME, MI, MN, NV, NH, VA, WI
margin of 5-10 pts.: AZ, FL, IA, IL, NJ, NC, PA
margin of 10-15 pts.: AK, DE, IN, NM, WA
margin of 15-20 pts.: MS, MT, OH, OR
margin of 20-25 pts.: CT, GA, MD, MO, SC, TX
margin of 25-30 pts.: CA, NY, RI, SD
margin of more than 30 pts.: AL, AR, DC, HI, ID, KS, KY, LA, MA, NE, ND, OK, TN, UT, VT, WV, WY

Will do swing and trend maps later.