While Trump probably wouldn't of done this good, in most scenarios it would still harm Romney.
National Popular Vote:
Obama: 51%Trump: 24%Romney: 23%All other candidates: 2%Closest States:
Oklahoma: Romney +.22Alabama: Trump+.25Idaho: Trump +.53Arkansas: Trump +.76Wyoming: Trump +.90Closer States:
Kentucky:
Obama+1.25South Dakota: Obama+3.29Tennessee: Obama+3.34North Dakota: Trump+3.86Nebraska: Obama+4.70Close States:
Kansas: Obama +5.55Arizona: Obama+5.60Mississippi: Obama+5.87Louisiana: Obama+6.90West Virginia: Trump +7.14 Indiana: Obama+7.87Montana: Obama +9.16Margin of victory: 10-20% (In chronological order):
South Carolina
Missouri
Alaska
Iowa
Texas
Ohio
GeorgiaMargin of victory: 20-40% (In chronological order, All for Obama unless otherwise specified)
Michigan
Wisconsin
Colorado
New Mexico
North Carolina (Tipping point; Obama fails to reach 270, D+21)
Florida
Minnesota
Pennsylvania
Nevada
New Hampshire
Virginia
National Popular Vote (D+27)
MaineUtah (Romney)Oregon
Washington
Delaware
Rhode Island
Illinois
New Jersey
Massachusetts
California
Connecticut
MarylandMargin of Vicotry (>40%; all for Obama):
New York 40%Hawaii: 43%Vermont: 60%Washington DC: 83%