The only CD's to vote for a different party in the Senate than in the House:
Dem Senate/Rep House
KS-3 (Orman)
MI-4
MI-7
MI-8
MI-11
MN-2
Rep Senate/Dem House
IA-2
ME-1
NE-2
Incredible polarization. That's only 6.1% of total seats (not counting Ala.)
Now that the map is basically finished (Hawaii's results can be guessed at, and MA and NJ are up at Ace of Spades), this list can be finished as well. 239 congressional districts voted in the 2014 Senate elections (double-counting OK and SC) -- of those, 12 voted for opposite parties for the Senate and House (12/239 = 5.02%):
IA-02 (Ernst/Loebsack)
IL-08 (Durbin/Dold)
KS-03 (Orman/Yoder)
ME-01 (Collins/Pingree)
MI-04 (Peters/Moolenaar)
MI-07 (Peters/Walberg)
MI-08 (Peters/Bishop)
MI-11 (Peters/Trott)
MN-02 (Franken/Kline)
NE-02 (Sasse/Ashford)
NJ-05 (Booker/Garrett)
TX-28 (Cornyn/Cuellar)
The only Senate candidate to win more than one congressional district that voted for the opposite party was Gary Peters in Michigan, who carried 4 such districts. The phenomenon of voting for a Democrat to the Senate but a Republican to the House was twice as common as the reverse; 8 of these 12 are D-Sen/R-HoR, and only 4 are R-Sen/D-HoR. (This counts Orman as a D).