Trump's become a runaway train in the GOP primary. Here's why.

A POLITICO analysis shows Trump ’s supporters are more conservative and more assured in their candidate than voters backing other Republican candidates.

They’re more conservative than other Republicans , more likely to be men, less likely to have graduated from college.

The analysis underscores the uphill climb Trump 's opponents have to unseating the former president as the leader of a Republican Party .

Three-in- four Trump voters, 76 percent , said they were definitely backing him in a Monmouth University-Washington Post poll.

Only 23 percent said they would even consider someone else.

Trump voters represent what has become the most influential voting bloc in the party: conservative voters with lower levels of educational attainment.