How would you replace/fix ObamaCare?

[Representative MJM]

Single-payer financed with "sin" taxes (alcohol, tobacco, surtaxes on tickets for moving violations). Basically, Medicare for all. 

So massive tax increases on the poor, then?

You speak the truth. These excise taxes are so ridiculous. Just pay for it with income taxes. Besides, a cigarette tax would hardly bring in enough revenue to pay for what could very well be a $1 trillion+ program.
But yes, single-payer is the way to go.