Aaron Swartz drops some science on those who would have you believe that a vote for Kerry is a vote for Al Qaeda:

The argument of Bush fans seems to be this: I like Bush. I don’t like bin Laden. Therefore bin Laden must not like Bush. But the objective facts seem to paint a different story: al-Qaeda loves Bush.

al-Qaeda Says So: As Reuters reported an letter from an al-Qaeda group said “it supported U.S. President George W. Bush in his reelection campaign, and would prefer him to win in November rather than the Democratic candidate John Kerry, as it was not possible to find a leader ‘more foolish than you (Bush), who deals with matters by force rather than with wisdom. … Kerry will kill our nation while it sleeps because he and the Democrats have the cunning to embellish blasphemy and present it to the Arab and Muslim nation as civilisation. … Because of this we desire you (Bush) to be elected.’ It seems pretty clear this isn’t reverse psychology.

Experts Say So: Anonymous, a top CIA expert on al-Qaeda, has concluded that al-Qaeda loves President Bush, and might go so far as to plan an election attack to rally the country around Bush.
“I’m very sure they can’t have a better administration for them than the one they have now. … One way to keep the Republicans in power is to mount an attack that would rally the country around the president.” This isn’t partisanship, because Anonymous is even more hawkish than Bush is.

Facts Say So: Even administration officials concede “al-Qaeda has morphed into a loose and expanding association of regional terror cells [and] the Iraq war has fueled rather than doused the fires of jihad.” Furthermore, Bush let bin Laden escape while he’s left the US dangerously insecure.

And in the New York Times, Krugman echos:

Last week, Republican officials in Kentucky applauded bumper stickers distributed at G.O.P. offices that read, "Kerry is bin Laden's man/Bush is mine." Administration officials haven't gone that far, but when Tom Ridge offered a specifics-free warning about a terrorist attack timed to "disrupt our democratic process," many people thought he was implying that Al Qaeda wants George Bush to lose. In reality, all infidels probably look alike to the terrorists, but if they do have a preference, nothing in Mr. Bush's record would make them unhappy at the prospect of four more years.