There’s been a shift in the political betting market amid speculation that presumptive Democratic nominee Joe Biden has already picked his running mate. Sen. Kamala Harris of California has become the odds-on favorite to be named Biden’s vice president.

Biden was photographed by the Associated Press Tuesday in Wilmington, Delaware, holding handwritten notes about Harris. “Do not hold grudges,” “Campaigned with me & Jill” and “Great respect for her” were among the talking points that could be seen as Biden spoke with reporters.

Before Biden’s appearance Tuesday, Harris was a +140 favorite to become his running mate, according to odds compiled by BetOnline. On Wednesday, Harris’ odds moved to -150.

Placing a $10 bet on Harris at -150 would net a $6.67 profit if Biden chooses her as his vice president. A bettor that put a $10 wager on Harris when she had +140 odds could make $14.

A Politico report Tuesday also might have caused bettors to consider making a wager on Harris. Politico published a post that stated Biden “chose Kamala Harris to become his running mate for the 2020 election on Aug. 1.”

The post has since been removed by Politico, which cited a “technical error.” It ignited some speculation that Politico might be aware of Biden’s choice and accidentally published a report that was supposed to be saved for the official announcement.

Susan Rice has the second-best odds +270 to be Biden’s vice president. Rep. Karen Bass of California is third at +450, followed by Sen. Tammy Duckworth, D-Ill., at +1000. Sen. Elizabeth Warren, D-Mass., has +1400 odds.

Rice wasn’t far behind Harris Tuesday with +225 odds, according to OddsShark. Duckworth had +500 odds before Tuesday’s developments.

Biden has said he’ll officially choose his running mate next week.