Wisconsin Gov. Scott Walker is still leading the pack of Republican presidential contenders in his home state, but his margins have narrowed as Ben Carson and Donald Trump see growing support, according to a Marquette Law School poll released Thursday.

The poll shows Walker ahead with 25 percent, followed by Carson at 13 percent and Trump with 9 percent. Walker’s numbers have dropped from 40 percent in April — when he had not officially entered the race. The Wisconsin governor is also seeing a drop in approval among his constituency. His approval rating is at 39 percent, with his disapproval rate at 57 percent, according to the poll — reflecting a 3-point difference from April.

“That’s notably underwater,” poll director Charles Franklin told reporters while unveiling the results.

Meanwhile, Democratic front-runner Hillary Clinton enjoys a sturdy lead at 44 percent, with Sen. Bernie Sanders following at 32 percent. Like Walker, Clinton has seen her lead narrow since April when she polled at 58 percent — before Sanders joined the race.