An Iowa poll conducted on July 26 placed Huckabee far behind front-runners Mitt Romney and Fred Thompson, but ahead of second tier candidates Tom Tancredo, Ron Paul, Duncan Hunter, and Tommy Thompson. Huckabee has also agreed to be part of a Cancer Forum in Iowa on August 28, held by cancer survivor Lance Armstrong. In the summer of 2007, Huckabee began to become closely compared to Kansas Senator Sam Brownback, also a Presidential candidate, for their similar socially conservative views. Huckabee and Brownback have been said to be the top candidates among evangelicals and other Christians. Huckabee tried to separate himself from Brownback (and succeeded, as Brownback dropped from the campaign) whom he saw as his main rival at that point. When asked what separates him from Brownback, he said that "the key difference is I've actually been a Governor for ten and a half years and I've run a government." He also said that no senator has been elected since JFK, and "frankly there's a good reason for that." Several polls in the state have placed Huckabee ahead of Brownback; a Mason-Dixon poll placed him at 7% with Brownback at 6. Huckabee acknowledged their similarities and said that "without a doubt, we're going after the same voters." Other sources have expressed concern that there is room for only one of them in the race, and that if Huckabee comes out on top, Brownback will struggle to raise money and vice versa.