A combination of early state and national polls provide mounting evidence that Sen. Elizabeth Warren of Massachusetts has begun to stall in the 2020 Democratic race, while South Bend, Indiana, Mayor Pete Buttigieg is soaring.

When Monmouth University released a poll on Tuesday showing Buttigieg overtaking Warren in Iowa, it raised eyebrows. Taken alone, it could have been dismissed, but it follows a Quinnipiac University poll from last week that showed them virtually tied in the state. Just a few weeks ago, Warren was emerging as a front-runner in the state, which is the first contest of the election cycle.