Last November:

State of Missouri – 2016 General Election – November 8, 2016
Official Results
As announced by the Board of State Canvassers on December 12, 2016

Office/Candidate Name Party Votes % of Votes
Constitutional Amendment 2 3238 of 3238 Precincts Reported
YES 1,894,870 69.95%
NO 814,016 30.05%
Total Votes: 2,708,886

Which resulted in this, in the Missouri Constitution:

Article VIII
SUFFRAGE AND ELECTIONS
Section 23
November 14, 2016

Section 23. 1. This section shall be known as the “Missouri Campaign Contribution Reform Initiative.”
2. The people of the state of Missouri hereby find and declare that excessive campaign contributions to political candidates create the potential for corruption and the appearance of corruption; that large campaign contributions made to influence election outcomes allow wealthy individuals, corporations and special interest groups to exercise a disproportionate level of influence over the political process; that the rising costs of campaigning for political office prevent qualified citizens from running for political office; that political contributions from corporations and labor organizations are not necessarily an indication of popular support for the corporation’s or labor organization’s political ideas and can unfairly influence the outcome of Missouri elections; and that the interests of the public are best served by limiting campaign contributions, providing for full and timely disclosure of campaign contributions, and strong enforcement of campaign finance requirements.
3. (1) Except as provided in subdivisions (2), (3) and (4) of this subsection, the amount of contributions made by or accepted from any person other than the candidate in any one election shall not exceed the following:
(a) To elect an individual to the office of governor, lieutenant governor, secretary of state, state treasurer, state auditor, attorney general, office of state senator, office of state representative or any other state or judicial office, two thousand six hundred dollars.
(2) (a) No political party shall accept aggregate contributions from any person that exceed twenty-five thousand dollars per election at the state, county, municipal, district, ward, and township level combined.
(b) No political party shall accept aggregate contributions from any committee that exceed twenty-five thousand dollars per election at the state, county, municipal, district, ward, and township level combined.
[….]

There’s more there. Look it up.

Which prompted this, in federal court:

Free and Fair Election Fund et al v. Missouri Ethics Commission et al (May 5, 2017) [pdf]

Today, from Attorney General Josh Hawley (r):

AG Hawley Announces Amendment 2 Appeal
May 30, 2017, 11:42 AM
Jefferson City, Mo. – Attorney General Joshua Hawley announced today that his office has appealed the federal district court’s judgment in the Amendment 2 case. That judgment invalidates portions of Missouri’s Constitutional Amendment 2 that impose restrictions on political campaign contributions. Amendment 2 was approved by nearly 70 percent of the voters in November 2016.
​“As Attorney General, I have a duty to defend the laws and constitution of the State of Missouri,” Hawley said. “The people of Missouri overwhelmingly voted to place these rules in our constitution, and my office will defend them.”

Interesting.

Stay tuned.

Previously:

Josh Hawley (r) – Attorney General – October 2016 Quarterly Campaign Finance Report (October 17, 2016)