He is the only state official being sworn into office Monday.
Backers filed nine versions of a proposed constitutional amendment that would phase out income taxes while levying a state sales tax on more purchases.
Allen West of Florida was sworn in Wednesday.
The Republican decided to not seek re-election and said he will work primarily out of Thompson Coburn's Washington, D.C., office.
Nixon's speech is scheduled to start at 7 p.m.
The intensity and interest in Proposition B is evident in the discussion on ColumbiaMissourian.com. Can we reframe the debate as the legislature talks of repeal?
The replacement for departing National Economic Council director Lawrence Summers will largely influence the administration's efforts to help reduce unemployment and improve the economy.
The state will elect eight representatives to the U.S. House in 2012, rather than nine. The change also creates an issue for the University of Missouri System Board of Curators.
Pay raises have been replaced by layoffs. Federal stimulus money is about to run out. Tax revenues are below last year's levels. Gov. Jay Nixon is projecting a budget gap equal to almost 10 percent of Missouri's general revenues. Reality is tempering recommendations for state spending.
Former Missouri Treasurer Sarah Steelman encouraged investors to avoid doing business with companies that sponsored terrorism, but reports show that she owned investments with companies engaged in the activities she denounced.
Nixon has his eyes set on a second four-year term.
Nixon's campaign said the governor has raised about $1 million since the Nov. 2 elections.
The Missouri Ethics Commission levied the fine against Rodney Hubbard, his campaign and the campaign's treasurer.
If Missouri loses a U.S. House seat, state legislators from St. Louis say it shouldn't be the 1st District seat held by Rep. William Lacy Clay Jr.
The runner-up for the position suggested the influx of staunchly conservative Republicans from the Nov. 2 election contributed to the loss of support for him.
Rep. Mike Talboy was elected Thursday night. He said his main priority will be a new jobs package.
How did your precinct vote? Use our interactive graphic to see results in every precinct in Boone County in local and statewide races.
Here are the results for all races on the ballot in Columbia.