WASHINGTON, D.C. — Attorney General Karl A. Racine today filed a lawsuit against Elevate, an online lender, for deceptively marketing high-cost loans carrying interest rates far above the District’s cap on interest rates. Elevate is not a licensed moneylender in the District, but offered two kinds of short-term loan products carrying interest rates of between 99 and 251 percent, or up to 42 times the legal limit.