They were proposals which from the mouth of such a man were at least somewhat surprising.

Publius Sulpicius Rufus (born in 630) owed his political importance not so much to his noble birth, his important connections, and his hereditary wealth, as to his remarkable oratorical talent, in which none of his contemporaries equalled him.
His powerful voice, his lively gestures sometimes bordering on theatrical display, the luxuriant copiousness of his flow of words arrested, even if they did not convince, his hearers.

As a partisan he was from the outset on the side of the senate, and his first public appearance (659) had been the impeachment of Norbanus who was mortally hated by the government party.( 22) Among the conservatives he belonged to the section of Crassus and Drusus.

We do not know what primarily gave occasion to his soliciting the tribuneship of the people for 666, and on its account renouncing his patrician nobility; but he seems to have been by no means rendered a revolutionist through the fact that he, like the whole middle party, had been persecuted as revolutionary by the conservatives, and to have by no means intended an overthrow of the constitution in the sense of Gaius Gracchus.
It would rather seem that, as the only man of note belonging to the party of Crassus and Drusus who had come forth uninjured from the storm of the Varian prosecutions, he felt himself called on to complete the work of Drusus and finally to set aside the still subsisting disabilities of the new burgesses--for which purpose he needed the tribunate.

Several acts of his even during his tribuneship are mentioned, which betray the very opposite of demagogic designs.
For instance, he prevented by his veto one of his colleagues from cancelling through a decree of the people the sentences of jurymen issued under the Varian law; and when the late aedile Gaius Caesar, passing over the praetorship, unconstitutionally became a candidate for the consulship for 667, with the design, it was alleged, of getting the charge of the Asiatic war afterwards entrusted to him, Sulpicius opposed him more resolutely and sharply than any one else.