http://fivethirtyeight.com/features/ted-cruz-might-still-be-able-to-stop-donald-trump/
The exit polls in Michigan and Mississippi asked voters who they’d pick in a two-way race between Trump and Cruz, also giving them the option to say they’d sit out the race. Among Rubio voters, on average between the two states, about 75 percent said they’d still vote in a Trump-Cruz race, and of those, 80 percent would prefer Cruz to Trump. Kasich voters were somewhat more equivocal; 55 percent said they’d still vote, and of those, two-thirds would go to Cruz over Trump. Although this is the first time the exit polls have asked about one-on-one matchups, the results are consistent with national polls showing Trump losing ground as the field winnows, as well as exit polls in previous states showing Trump being unpopular with Republicans who aren’t already supporting him.
The exit polls in Michigan and Mississippi asked voters who they’d pick in a two-way race between Trump and Cruz, also giving them the option to say they’d sit out the race. Among Rubio voters, on average between the two states, about 75 percent said they’d still vote in a Trump-Cruz race, and of those, 80 percent would prefer Cruz to Trump. Kasich voters were somewhat more equivocal; 55 percent said they’d still vote, and of those, two-thirds would go to Cruz over Trump. Although this is the first time the exit polls have asked about one-on-one matchups, the results are consistent with national polls showing Trump losing ground as the field winnows, as well as exit polls in previous states showing Trump being unpopular with Republicans who aren’t already supporting him.