Who funded the pro-Amendment 3 campaign?

Missouri Digital News has a story that details who made the contributions that funded the collection of over $150,000 signatures to put proposed Missouri Constitutional Amendment 3--which will take approximately $190 million out of the state general fund each year and earmark it for maintaining and building new roads:

The push to pass a constitutional amendment that would route money raised by transportation related taxes to road construction has been largely fueled and driven by several of the state's top road builders, as well as labor unions and other public works contractors, campaign finance records show.~

Contributions totalling nearly $1 million dollars have been made to the Committee to Improve Missouri Roads and Bridges this election cycle.

Critics of the ballot measure, which voters will decide on Nov. 2, claim the amendment would benefit contractors more than citizens. Advocates argue it is in the interest of everyone driving on Missouri's rough roads, which finished 48th in a recent federal ranking of state road quality.

The Missouri Bicycle Federation's opinion about Amendment 3, and links to websites pro and con, is here.