The ironclad relationship that India Prime Minister Narendra Modi has developed with CEOs of the largest U.S. tech companies is giving his nation the foreign support that India has craved for more than a decade. Those ties also have boosted Modi's own profile ahead of key elections that start Friday, a former Indian government official told CNBC on the condition of anonymity. The promise of further economic growth in India as China's economy slows has led many American CEOs to support Modi's policies. Tensions between Washington and Beijing have also pushed U.S. conglomerates to diversify their manufacturing bases to