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... eius lenivit, pridem invisus, tamquam ducta in matrimonium Vipsania...

"Tamquam" is also followed by the subjunctive, "agitaret," expressing a further reason for Tiberius' dislike of Pollio: he was (Tiberius felt) contemplating/aspiring to be more than a citizen. Cf. OLD 16 s.v. "agito."