Quote from : The Early History of Rome: Book

Others Exonerated the plebs and threw the blame upon the patricians: it was owing to their artful canvassing that the plebeians found the road to office blocked; if the plebs might have a breathing-spell from the mingled prayers and menaces of the nobles, they would think of their friends when they went to vote, and to the protection they had already won would add authority. It was resolved in order to do away with canvassing, that the tribunes should propose a law forbidding anyone to whiten his toga, for the purpose of announcing himself a candidate. This may now appear a trivial thing and one scarcely to be considered seriously, but at the time it kindled a furious struggle between the patricians and the plebs. Yet the tribunes prevailed and carried their law: and it was clear that the plebeians in their irritated mood would support the men of their own order.