Great expectations for US economy: Are Obama, Romney too
optimistic?  Mitt Romney and President Obama both present to
voters rosy views of future economic growth. Those scenarios
aren't impossible, but it's fair to attach some big asterisks to
them.  By , Staff writer  Here's a pocketbook pointer for
American voters to consider: As the presidential candidates make
their closing arguments, both President Obama and rival Mitt
Romney are offering visions of the economy that tilt heavily
toward optimism – and that may not be a good thing when it comes
to making good on their fiscal promises.  A case in point: Mr.
Obama's budget proposal this year assumed an economy growing by
3 percent, adjusted for inflation, during the 2013 calendar
year. The consensus among top private-sector forecasters calls
for 2 percent growth, according to a monthly survey by Blue Chip
Economic Indicators.  A single percentage point may not sound
like much, but the difference amounts to one-third of the
economic growth that the White Hous