Florida Sen. Marco Rubio had a very good month.

The Florida Republican enjoyed a notable bounce in support since formally entering the 2016 White House race on April 13, with three-out-of-four GOP primary voters now saying they could vote for the first-term senator, up from 56% in March, according to a new Wall Street Journal/NBC News poll. Only 15% say they could not see themselves supporting Mr. Rubio, the lowest among the 10 Republicans included in the survey.

The results suggest Mr. Rubio is the most widely acceptable Republican presidential contender among likely GOP primary voters, outpacing former Florida Gov. Jeb Bush, at 70%, and Wisconsin Gov. Scott Walker, at 61%. Mr. Rubio also claimed that distinction in the last Journal survey conducted in early March, more than a month before he announced his intention to run for president.