What is the significance of Frank watching Lucas kiss Zoe?
During season 01 episode 07 of House of Cards, at about 41 minutes into the episode, Lucas drunkenly stumbles into Zoe and in a half-coordinated romantic advance, kisses her.
Frank, watching in his car, makes this face:
The background music then changes to a serious tone, so this must have somehow been a significant moment—but my question is, how was it significant? What did it mean?
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