By politically I'm imagining a politician campaigning on the promise to increase the basic minimum income. Vote for me and I'll get your basic income increased. Don't vote for my opponent because they just want to cut your basic income! It's the tax issue all over again.
Exactly, and just as likely to be gummed up by complexity. After all, how can you be against teachers and firefighters receiving just a little more BI for their essential, thankless jobs?
You forget the US is run by the rich, which is why this does not happen with Social Security. It's all about not having the benefit cut instead of increasing benefits or lowering retirement age.