Getty/Brendon Hoffman Calls for another round of stimulus are overblown, and investors should simply stay the course for historically strong gains, James Paulsen, chief investment strategist at The Leuthold Group, said Thursday."Regular temper-tantrums on Wall Street" have convinced investors that failure to pass a near-term bill will tank stocks, but many are ignoring the massive stimulus already passed, he added.The policy response to COVID-19's economic fallout dwarfs those used in the four other instances of outsized stimulus.Enacting another relief package risks long-term challenges from paying the bill, and precedent suggests the amount of stimulus already passed will give way to a decade of healthy market gains, Paulsen said.Visit the Business Insider homepage for more stories.Amplified calls for more fiscal stimulus ignore the economic recovery's current strength, James Paulsen, chief investment strategist at The Leuthold Group, said Thursday.Investors, executives, and lawmakers have spent recent weeks clamoring for a new bill, warning that failure to pass fresh stimulus endangers the nation's rebound.