Jessica Taylor

Updated at 9:40 a.m. ET Tuesday

The Iowa caucuses aren't over yet. A delay in the results meant the state Democratic Party did not call the race Monday night as expected, leaving the candidates and their supporters in limbo.

The candidates in the top 1% have accounted for about 78% of the ad spending in the presidential race so far, according to new numbers.

The two self-funding billionaires in the Democratic primary, former New York City Mayor Mike Bloomberg and activist business executive Tom Steyer, have spent the most by far — a combined $320 million, out of $409.8 million spent in the presidential contest up to Jan. 13.

The impeachment of President Trump has revived interest in the first president ever to be impeached over 150 years ago, Andrew Johnson.

In Greeneville, Tenn., the site where Johnson's former home is preserved has seen a recent surge in visitors, similar to a spike around the time that former President Bill Clinton was impeached in 1998.

The Democratic stage will be the smallest yet for next Tuesday's Iowa debate, with just six candidates set to qualify.

Billionaire activist Tom Steyer on Thursday likely became the latest candidate to qualify after two Fox News polls from Nevada and South Carolina showed him in the double digits. Steyer has been spending millions of dollars in early states to boost his chances.

Embattled California Republican Rep. Duncan Hunter is set to resign from Congress on Jan. 13 after pleading guilty last month to misusing campaign funds.

Hunter had long decried the charges against him as politically motivated, but in early December he struck a deal to plead to just one count of illegal use of campaign funds. He later said he would resign "Shortly after the Holidays."

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