Why is Obama afraid of Rush Limbaugh?

This weekend, President Obama used a old time tactic and that was to attack a messenger.
Obama is quoted of saying to the Republican Lawmakers that they shouldn’t be listening to Limbaugh if they plan on getting along with him.
"You can't just listen to Rush Limbaugh and get things done," he told the GOP leaders during a discussion about his planned stimulus package.

Obama’s tactic is very clear and that is to squash the the conservative vote and have Republicans support a ill advise poorly written, Democrat stimulus plan. Eight hundred and twenty-five billion dollars from everything from building a bridge to no where to contraceptives.
Of course Nancy Pelosi was asked to remove this item from the stimulus,or could you call it that?

So Obama attacked Limbaugh and threaded Republican conservatives Indirectly. In doing so he may have put his foot in his mouth as Bill Clinton did when he complaint that nobody was listening to him and when after Limbaugh.
Limbaugh said that Obama’s

"plan is to isolate elected Republicans from their voters and supporters by making the argument about me and not about his plan. He is hoping that these Republicans will also publicly denounce me and thus marginalize me."

But what President Obama’s real message by attacking Rush Limbaugh was to hide what he was really doing with the so call stimulus.

If Obama really wanted to do something right now to stimulate the economy and that would be for the next year to end all taxes on everyone, rich and poor. No income taxes, no payroll taxes, No sale tax, no Excise Tax, no nothing! That would be a real stimulus to the US economy.

Instead of attacking Rush Limbaugh, Sean Hannity and other conservatives, Obama should be stopping the Democrat leadership from spending our children’s money.
Obama doesn’t seem to be worry about the 40 thousand people who lost their jobs yesterday and the two million jobs that is expected to be lost under the Obama administration by the end of the year.

Rush Limbaugh said it right:
"Obama’s plan would buy votes for the Democrat Party, in the same way FDR’s New Deal established majority power for 50 years of Democrat rule.

Why would Obama beg for Republican votes for this ill advise stimulus? Of course if this measure does nothing for the economy and makes it far worst. Then he can blame Republicans and have a out. Republicans need to hold firm against this measure.