Dietzel, an 18-year veteran of the office, was elected to succeed 35-year incumbent Bettie Johnson.
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The veteran public defender defeats Republican Mike Whitworth and will succeed retiring Judge Larry Bryson.
Vicki Hartzler defeated Democrat Nate Irvin and Libertarian Herschel Young in Tuesday's election in the 4th Congressional District, which stretches from Columbia to the Kansas border.
Schweich had no Democratic opponents but faced challengers from both the Libertarian and Constituion parties.
The Democratic incumbent, who was appointed the top county official after the death of Ed Robb in 2011, was elected to a full four-year term for the first time.
Promising economic signs of a drop in the unemployment rate and cheaper gasoline failed to help the president's party, which typically loses seats in midterm elections.
The 13-year veteran of the collector's office will succeed his boss, Pat Lensmeyer.
The measure would have guaranteed the protection and recognition of "every human being at every stage of development."
UPDATE: Medical marijuana initiative narrowly defeated in Florida, recreational marijuana legalized in Oregon
Legalization advocates had high hopes of Florida permitting medical marijuana, but voters' support for the amendment flamed out short of the necessary 60 percent of votes to pass. However in Oregon, the state has become the third in the nation to legalize recreational marijuana usage.
Rep. Emanuel Cleaver, D-Mo., defeated Republican Jacob Turk and Libertarian Roy Welborn to gain re-election.
Wisconsin Republican Gov. Scott Walker won re-relection over Democratic challenger May Burke. In another hotly-contested governor's race, Florida GOP Gov. Rick Scott also held on to his office.
The Republican defeated Democrat Courtney Denton and Libertarian Steven Hedrick for the 3rd Congressional District, which stretches from the outer St. Louis suburbs to Jefferson City.
Republicans have not controlled the Senate for eight years. Though gaining control is a political victory for them, the impact on governing is unclear.
Here are the results for Missouri's four proposed amendments and the state auditor's race.
Republican U.S. Rep Jason Smith will serve his first full term. Previously, he succeeded Republican Rep. Jo Ann Emerson, who resigned.
More than 18.6 million Americans in 32 states voted early — either by mail or at early polling places. And millions more had their say in another way — by sitting this election out.
Rep. Graves, R-Mo., won his 8th term in the U.S. House.
Missourians vote down teacher evaluation proposal, pass child sex abuse evidence law, reject early voting, approve limiting governor's budget powers
The amendment would have linked teacher evaluations to student performance and limited tenure protections.
Proposition 1 asks voters to support a larger police force and more firefighters through an increase in property taxes. But some experts say it's hard to know if more officers would improve community policing.