These are the latest state polls for the party nominations for president. For the Republicans, Scott Walker leads in Illinois -- but Donald Trump is not doing badly. He is in second place, 5 points behind Walker and 7 points ahead of Jeb Bush (who finished in third). Things are different in Iowa and Florida. In Iowa, Trump has a 15.5 point lead over second place finisher Walker. In Florida, Trump has a 6.1 point lead over Bush (who finished in second).
For Democrats, the Illinois and Iowa polls show Hillary Clinton maintains a significant lead over Bernie Sanders -- by 37 points in Illinois, and by 26.8 points in Iowa. The Florida poll did not survey Democrats.
The Illinois poll is by Public Policy Polling. It was done on July 20th and 21st. The queried 369 Republicans (moe of 5.1 points) and 409 Democrats (moe of 4.9 points).
The Iowa survey is the One America / Gravis Marketing Poll. It was done on July 29th, and contained 277 Republicans (moe of 6.5 points) and 236 Democrats (moe of 6.4 points).
The Florida results are from the St. Pete Poll. It was done between July 18th and 28th and surveyed 1,902 Republicans, with a 2.2 point margin of error.