I read this as specifically giving congress the authority to set limits on raising and spending money. I don't see any language granting them to ability to restrict political speech.

SECTION 1.To advance democratic self-government and political equality, and to protect the integrity of government and the electoral process, Congress and the States may regulate and set reasonable limits on the raising and spending of money by candidates and others to influence elections.

[0] - https://www.congress.gov/bill/113th-congress/senate-joint-re...