"What's difference
will there be between Obama
presidency & McCain presidency?"

The greatest difference between an Obama presidency and a McCain presidency
most likely will be their impact on the supreme court (see
Age of Supreme Court Justices).
If even two among the Supreme Court Justices Stevens (88 years old), Ginsburg
(75), Breyer (70), and Souter (69) retire over the next 4-8 years, a McCain
presidency could lock in a 6:3 conservative majority in the high court for the
next generation and finally overturn Roe v Wade (see
Abortion Is Murder).
Instead, if either Justice Scalia or Kennedy, both 72 years old, retires over
the same period, an Obama presidency will lock in a 6:3 or 5:4 liberal majority
for the next generation capable of not only upholding Roe v. Wade but also
striking down the homosexual marriage bans adopted by 29 states thus far (see
Bible Verses About Homosexuality).
On foreign policy, President Obama will pull troops out of Iraq, most probably
lose the war in Afghanistan and fail to prevent
Iran from acquiring nuclear
weapons.
Iraq and Afghanistan will become to us what Afghanistan was to the
Soviet Union, and America’s influence in the Middle East will wane, further
imperiling our energy future.
On the economic front,
Barack Obama will shift the country closer to
socialism, and the Democratic majorities in the House and Senate will given him
free reign to do so. As the government attempts to print its way out of the
deepening recession, our dollar will devalue while inflation and the national
debt rise.