Is there any truth to the allegation made by Romney that in order to make Obamacare work, Obama filtered huge amounts from the Medicare system or was that blowing smoke
Depends on the meaning of 'truth' is.
Obamacare is in part paid for by reducing the rate of growth of Medicare by $760 Billion dollars. This will be"paid" for by cost savings through improved efficiences in Medicare. Please note that actual expenditures for Medicare are projected to continue rising. A couple of comments:
1. Politicians of all persuasions endlessly promise cost savings in government programs through improved efficiences that never materialize. To suppose that this will happen with Obamacare is IMO, magical thinking. To paraphrase from the software industry, government inefficiency is not a bug, it's a feature.
2. In order to defend Obamacare, Democrats have been forced to argue for the first time, that cutting the rate of growth in a government program is not an actual 'cut'.