Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
The right of the senate to give dispensation in particular cases from the laws was restricted (687); as was also the abuse whereby every Roman of rank, who had private business to attend to in the provinces, got himself invested by the senate with the character of a Roman envoy thither (691). They heightened the penalties against the purchase of votes and electioneering intrigues (687, 691); which latter were especially increased in a scandalous fashion by the attempts of the individuals ejected from the senate(1) to get back to it through re-election.
1. Cf. V. III. Renewal of the Censorship
What had hitherto been simply understood as matter of course was now expressly laid down as a law, that the praetors were bound to administer justice in conformity with the rules set forth by them, after the Roman fashion, at their entering on office (687).
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Reference address : https://www.ellopos.net/elpenor/rome/5-05-parties-pompeius.asp?pg=5