Donald Trump leads Hillary Clinton by 44 percent to 42 percent, and U.S. Senator Chuck Grassley leads Democratic challenger Patty Judge by 52 percent to 42 percent, according to a Monmouth University poll released today.

Only 6 percent of Iowa respondents surveyed between July 8 and 11 were undecided on the presidential race. Monmouth also found 6 percent support for Libertarian nominee Gary Johnson, 1 percent for the Green Party’s Jill Stein, and 2 percent saying they will vote for some other candidate. No Libertarian presidential candidate has ever received more than 1 percent of the vote in Iowa. Historically, minor-party presidential candidates have performed far less well in November elections than their summer poll numbers would suggest.

Iowa is a toss-up state in many election forecasts, and I’ve always expected a close race here, so I am not surprised to see Trump slightly ahead in a poll. That said, these Monmouth data are difficult to believe:

One unusual finding in the poll is that Trump leads among voters under 50 years old in Iowa. In Monmouth polls conducted nationally and in other states, Clinton has held an advantage with younger voters. Specifically, 51% of Iowa voters under age 50 currently support Trump, compared to 32% for Clinton, 7% for Johnson, and 3% for Stein or another candidate. Among voters age 50 and older, Clinton has the edge with 50% support, compared to 38% for Trump, 4% for Johnson and 1% for Stein or another candidate.

Monmouth’s numbers indicate that Grassley is in for his most competitive re-election bid. The last two public polls of Iowa’s U.S. Senate race were by Public Policy Polling, which does a lot of work for Democratic clients, including Judge’s campaign during the primary. So it was easy for Republicans to dismiss PPP’s findings showing Grassley below 50 percent and only 7 points ahead. In Monmouth’s survey, Grassley leads by just 10 points, which for him is a very small margin. He enjoyed larger leads in 2010 polls, other than those by Research 2000, a firm later discredited for apparently fabricating data.

You can’t say Monmouth’s sample is skewed to Democrats, because Trump is leading Clinton. The best news for Grassley is his job approval rating: 56 percent, with only 33 percent disapproving of his work in the Senate. However, only 25 percent of Monmouth’s respondents approve of the Judiciary Committee chair’s decision not to hold hearings on U.S. Supreme Court nominee Merrick Garland.

Grassley’s favorables are in net positive territory, according to Monmouth: 46 have a favorable opinion of him, 31 percent unfavorable. Judge has more room to grow: 30 percent favorable, 14 percent unfavorable, and 56 percent of respondents not knowing enough about her to have an opinion. Grassley’s campaign has been trying to define the Democratic challenger in a negative way, most recently claiming in a press release today that she is harder to find around Iowa than a Pokemon.

Any comments about the presidential or Senate race are welcome in this thread. Monmouth surveyed 401 “Iowa residents likely to vote in the November election” between July 8 and 11, producing a margin of error of plus or minus 4.9 percent. Monmouth’s polling memo did not mention the likely voter screen used.