Because... why the hell not thinking about that?
Imagine an alternate timeline with Bill Clinton's repeatedly asked Hillary to marry him in 1974-75 backfired, as she end up grew tired of him and decides to look for someone else.
Next, she has some business that led her to met with a dashing young businessman named Donald J Trump, they begun to date and in 1977, they end up married.
Assume Hillary still keep her interests in politics, and Donald Trump is still Trump... and because Hillary is a politician, somehow they end up maintaining their marriage (or simply get the cupid managed to keep both of them in love).
What will history proceed afterwards?