Obama is scheduled to attend a fundraiser for Democratic nominee Robin Carnahan's senatorial campaign in Kansas City.
The lawsuit asks a judge to declare Gov. Jay Nixon's directives for school funding illegal and to order the state to pay Kansas City schools under a separate plan approved by the legislature.
Purgason has begun airing ads criticizing Republican front-runner Roy Blunt as a "Washington insider."
The ballot measure would defy the federal health care law requiring most Americans to have insurance or face fines, starting in 2014.
Gov. Jay Nixon visited Columbia auto workers and touted legislation aimed at keeping Ford Motor Co. in Missouri.
Nixon planned to speak Tuesday to a Columbia factory that makes axles for Ford Motor Co. The governor is considering calling a special session starting June 28 on legislation providing incentives for companies that make factory improvements for new products.
Scott Eckersley is running as a Democrat for the same seat currently held by former Gov. Matt Blunt's father, Roy Blunt.
Her itinerary includes a stop in Columbia on Wednesday.
The ethics bill passed by the General Assembly on Friday does not include renewed caps on campaign donations.
One lawmaker said the original age restriction was meant to be a compromise, and the ban should apply to everyone, not just those under age 21.
Despite some officially upbeat assessments, the session ended Friday with a ho-hum evaluation from many rank-and-file lawmakers.
Here's a wrap-up of the action from the last day of the Missouri General Assembly's 2010 session.
The Missouri legislature began moving on several major issues during its final week of the 2010 session. These issues included ethics reform, insurance for families with autistic children, plumbing restrictions and a jobs bill.
Nancy and Phil Harter are moving back to the East Coast after seven years of committing to Columbia's academic and political communities.
Missouri House and Senate negotiators seemed to have reached an agreement on Wednesday on rules guiding the ethics of moving money between committees.
Kagan would bring diversity to the Supreme Court's way of thinking, says an MU Law School Professor. "It's not really ideologically charged," Richard Reuben said. "It's not a nomination that's going to make the other side mad."
Obama will officially announce his choice at 10 a.m. in the East Room of the White House alongside Vice President Joe Biden. Kagan will also speak.
With only one week remaining in Missouri's legislative session, there are still several bills labeled as "must haves" that have yet to pass.
An Associated Press analysis shows that of reductions in the budget, only about 40 percent are actual cuts in state spending (in which programs would receive less money in 2011 than they were budgeted to receive in 2010).