Look at Article I, Section 4 and tell me what that means.
Section 4. The times, places and manner of holding elections for Senators and Representatives, shall be prescribed in each state by the legislature thereof; but the Congress may at any time by law make or alter such regulations, except as to the places of choosing Senators.
I'm having a hard time seeing how this condones the creation of "speech crimes". Speech about the election isn't the election itself.
Speeches are not banned at any time.
Laws already created the catagory of speech crimes though they are called violations of election laws such as: giving speeches within a polling place; passing out campaign literature within 100 yards of a polling place; putting up posters within 100 yards of a polling place; buying votes (why should that be illegal?); or having sample ballots showing how to vote RAT posted within the polling place.
Advertizing is part of a "manner" of holding elections.