By Miguel Gutierrez, Michael O'Boyle and Dave Graham MEXICO CITY (Reuters) – Mexico's Congress on Thursday approved a government-backed bill to increase weak tax revenues but watered down the measure that is expected to have only a moderate effect on the tax take. The ruling Institutional Revolutionary Party (PRI) pushed the bill through with leftist lawmakers, making final tweaks to slightly weaken a proposal to increase income tax rates. Conservatives said the bill was a menace to the stumbling economy and walked out of the Senate in protest when their attempts to change the plan were ignored by the PRI. Lawmakers in the lower house of Congress gave final approval to the tax bill, and President Enrique Pena Nieto is expected to sign the measures into law.
