With the Iowa caucuses just days away, Political TV Ad Archive data are showing the campaign committees supporting Bernie Sanders and Hillary Clinton have each sponsored more than 4,500 TV ad airings in January on broadcast stations in key markets there.

Super PACs figure prominently as sponsors of ads favoring Jeb Bush, Ted Cruz, and Marco Rubio. In particular, the super PACs supporting Ted Cruz stepped up their advertising on behalf of the candidate in January.

To dig into the details behind ad airings, search here on the Political TV Ad Archive website, or download a csv of all the metadata underlying ad airings here. Air counts of ads are automatically updated throughout the day. The ads listed reflect all the ads captured by the Political TV Ad Archive, which strives to be comprehensive.