So far, it’s been a tough U.S. Senate campaign for former Lieutenant Governor Jane Norton.

This week, she submitted enough valid signatures to qualify for a spot on the primary ballot, setting the stage for a showdown with Weld Count District Attorney Ken Buck, the underdog-turned-frontrunner who made the ballot by winning 77 percent of Republican assembly votes last month (via The Denver Post).

“Our campaign is energized by the huge outpouring of grassroots support from the voters across the state,” Norton proclaims in statement.

But a survey from Magellan Strategies shows Norton continues to struggle against Buck.

Of 1,026 likely Republican voters in Colorado, 42 percent say they would vote for Buck, compared with 32 percent favoring Norton.

The good news for Norton is that 26 percent remain undecided.

For Buck, the turnaround is dramatic. Back in March, a similar Magellan poll showed Norton leading 41 percent to 15 percent. But by April, Buck had closed the gap, taking a three-point lead, The Tribune points out.