WAUSAU, WI (WTAQ) - A so-called “Super Political Action Committee” and a big labor union are spending almost $900,000 on TV ads against three Republican U.S. House members, including Sean Duffy of the Wausau area.

The House Majority Super-PAC has reserved almost $600,000 of TV time in the Minneapolis-St. Paul market for ads attacking Duffy and Minnesota Republicans Chip Cravaack and John Kline. And the Service Employees International Union is putting up $300,000 for those ads.

Cravaack is a main target of Democrats, after he unseated long-time incumbent Jim Oberstar two years ago.

Duffy is another first-term member who’s expected to face a strong challenge from former state Senate Democrat Pat Kreitlow.

Kline is a 10-year incumbent from the southern Twin Cities’ region.