“There’s no telling what could happen in just a matter of a couple of years,” Carson said.
The key Senate race may be headed to a runoff.
The findings in the CNN/ORC poll are within the margin of error.
Campaign officials in both parties are making efforts to run up the score in early voting.
Ernst edged Braley 44% percent to 38 percent in one of the most competitive races.
Cruz won 25 percent of votes at the annual Washington conference.
New York Gov. Andrew Cuomo will receive briefings from Pentagon officials and meet troops.
David Young isn’t expected to go back on air in Des Moines until next month.
She won’t say if she asked the White House to keep Obama away from her home state.