The final Iowa pre-caucus poll from the highly regarded Bloomberg/Des Moines Register/Selzer poll finds businessman Donald Trump and former Secretary of State Hillary Clinton leading in their parties' contests. In the Republican caucus, Trump leads Texas Sen. Ted Cruz, 28 percent to 23 percent. In the Democratic caucus, Clinton leads Sen. Bernie Sanders (I-Vt.), 45 percent to 42 percent.
Florida Sen. Marco Rubio is trailing in third place among Republicans with 15 percent support and retired neurosurgeon Ben Carson has 10 percent. Other Republican candidates are in single digits.
Notably, former Florida Gov. Jeb Bush, who at $15 million has spent more money on ads than any other candidate in Iowa, has dropped to just 2 percent. 注目的事，前佛罗里达州长Jeb Bush，花费1500万美元在广告上（比其他任何候选者都多），反而跌了2%。
Polls in recent days have shown a close race for both caucuses.
