The dozen-plus Democrats with White House ambitions aren't the only ones gearing up for the 2028 campaign slog: Political foes now see spouses as fair game, so potential candidates' partners are prepping for the vitriol — in wildly different ways. Why it matters: Would-be first ladies and first gentlemen already are building public profiles — some with vigorous enthusiasm, others not so much. Driving the news: The partners with the sharpest contrast in their approaches are Jennifer Siebel Newsom and Lori Shapiro — the wives of California Gov. Gavin Newsom and Pennsylvania Gov. Josh Shapiro, respectively. Siebel Newsom is very public-facing, frequently opines on political issues, gets in spats with the press, and is active on social media. Lori Shapiro rarely talks politics and became a bit more present on social media only after the 2024 election.…