Liberal blog site Daily Kos and the Service Employees International Union (SEIU) today announced a new partnership in public opinion polling. According to Roll Call, the groups plan to measure President Barack Obama's approval and favorable polling numbers each week.

The polling, conducted by Democratic firm Public Policy Polling, will be published each Tuesday on dailykos.com and feature testing on Congress, the generic Congressional ballot, Obama's re-election and the two major political parties. Polling on "key races" will also be conducted, according to a press release announcing the partnership.

"Daily Kos is committed to advancing a new generation of progressive activists across the country and partnering with the 2.2 million members of SEIU is a huge step forward for everyone," Kos publisher Markos Moulitsas said in a statement. "Rather than sit around and have know-nothing pundits and politicians in DC tell us what the American people think, we prefer to ask them directly. And this partnership will allow us to conduct significantly more polling than any other media organization in the country."